Mu (letter)
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| Greek alphabet | |
|---|---|
| Α α Alpha | Β β Beta |
| Γ γ Gamma | Δ δ Delta |
| Ε ε Epsilon | Ζ ζ Zeta |
| Η η Eta | Θ θ Theta |
| Ι ι Iota | Κ κ Kappa |
| Λ λ Lambda | Μ μ Mu |
| Ν ν Nu | Ξ ξ Xi |
| Ο ο Omicron | Π π Pi |
| Ρ ρ Rho | Σ σ Sigma |
| Τ τ Tau | Υ υ Upsilon |
| Φ φ Phi | Χ χ Chi |
| Ψ ψ Psi | Ω ω Omega |
| obsolete letters | |
| [[Digamma|Template:Polytonic Digamma]] | [[San (letter)|Template:Polytonic San]] |
| [[Qoppa|Template:Polytonic Qoppa]] | [[Sampi|Template:Polytonic Sampi]] |
Mu (upper case Μ, lower case μ) is the 12th letter of the Greek alphabet. In the system of Greek numerals it has a value of 40. In the ISO 8859 character encodings standard, it has an ordinal decimal value of 230.
The lower-case letter μ is used as a special symbol in many academic fields.
- In mathematics:
- the Möbius function in number theory
- the population mean or expected value in probability and statistics
- a measure in measure theory
- In measurement:
- the SI prefix micro-, which represents one millionth, or 10−6
- the micron, an old unit which corresponds to the micrometre (which is now denoted "µm")
- In classical physics and engineering:
- In particle physics:
- the elementary particle called the muon
Rarely, the letter μ may be used to distinguish one item represented by "m" from another (but a better option might be to use "m", "m", "m", etc.).
Letters that arose from the Greek Μ include the Latin M and Cyrillic М.da:My (bogstav) de:My el:Μι fr:Μ ja:Μ pl:Mi (litera) pt:Μ fi:Myy sv:My zh:Μ